From Ars Technica:
There is heightened interest in this launch because, for the first time, SpaceX will attempt to "catch" one of the two payload fairings that enclose the satellite at the top of the rocket. The value of these fairings is about $6 million, and recovering and reusing them would both save SpaceX money and remove another roadblock on their production line for Falcon 9 rockets. These fairings will separate from the rocket at about three minutes after launch and are "steerable" in the sense that SpaceX hopes to guide them back to a target located in the ocean.
"Going to try to catch the giant fairing (nosecone) of Falcon 9 as it falls back from space at about eight times the speed of sound," SpaceX founder Elon Musk said on Instagram Thursday morning. "It has onboard thrusters and a guidance system to bring it through the atmosphere intact, then releases a parafoil and our ship with basically a giant catcher’s mitt welded on tries to catch it."
https://arstechnica.com/science/2018/02/spacex-to-try-again-...
They didn't 100% succeeed in their first attempt at this, but got really close!